TID 18, 8 x 220 mm screws are a hard limit?

T

threesixright

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Aug 17, 2017
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Hi All,

Just got my TID 18. Quickly scanning the manual I read the max screws are 8 x 220 mm in soft wood.

I assume thats full threaded. Now it happens I need to drive in some 8 x 300 (ish) screws, ½ partial threaded. I'm guessing I will be fine, since its not full threaded. Nevertheless, curious how serious you need to take this limit? Trial on error?

 
Just go ahead and try. Don't worry, that 80 mil is not going to make a difference.

There are many factors that decide the forces involved when driving screws, and you can't set clear boundaries.

If your 80 x 300 screws won't go in, consider pre-drilling or putting a bit of oil on their tips to make it easier.
 
I pre-drill as much as possible with softwoods.
Aussie hardwoods 100% of the time!
I normally pre-drill using the 80% / 20% rule.
You can remove 80% of the timber as the screw only requires 20% of timber to thread itself tight.
A good example would be a 100mm batten screw which is 5mm thick.
I will always pre-drill using a 4mm drill bit. Hence the 80% / 20% rule.
 
Sorry guys, I stated it was ½ threaded but i meant (ofc) partial threaded.

I always understood when using partial, you just pre-drill (connecting two beams in this case) one with the diameter of the thread itself.

Don't want to make this academical  [big grin]

My assumption was if the manual states max 8x220 mm, then that would indicate using the actual thread length x 2-ish (assuming you pre-drill) ?
 
On a screw that big, after pre-drilling, try rubbing the threads on a bar of soap. The soap stays where you want it on the threads and helps the threads cut like butter! Back in the day every old timer would have an old chewed up, terrible looking bar of soap in his tool bag.
 
threesixright said:
Sorry guys, I stated it was ½ threaded but i meant (ofc) partial threaded.

I always understood when using partial, you just pre-drill (connecting two beams in this case) one with the diameter of the thread itself.

Don't want to make this academical  [big grin]

My assumption was if the manual states max 8x220 mm, then that would indicate using the actual thread length x 2-ish (assuming you pre-drill) ?
Click to expand...

Don't sweat it. The tool has a certain torque capability beyond which the screw will just not move forward anymore.
That's all is going to happen. The size stated in the manual is barely an indication of the tool working envelope.

Just try and you'll see for yourself if it's too slow to work comfortably, you'll quickly realize you need a beefier impact.

Obviously if it takes 30 seconds of hammering to drive a single screw in and you insist on driving them anyway you might trigger a thermal protection at some point.
 
I drove a 3/8" x 4" long lag screw into 4" of well seasoned birch heartwood without predrilling (not into end grain). Needed speed three after the first couple inches. I did not time it. It wasn't fast but it wasn't slow either.  Bad for the driver?    I don't know. But it certainly isn't how I would ordinarily use it.  I just wanted to see what it could do. It actually started to drive the hex head below the surface. I stopped at that point.

Seth
 
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